Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5204cb5842f3b92…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 21:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8bbb144d06ea015c7f4fb07744705eee SHA-1: e2e1e909561453514e5e969650bb56e642d36cec SHA-256: c5204cb5842f3b9275b32e9c361dda0ca332c47486b2afd2270abd985731d4e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=sodium+carbonate+and+sulfuric+acid+net+ionic+equation PDF link annotation
    • http://kooijobs.in/ckfinder/userfiles/files/61977437496.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/tupemolokunof.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/13677123922.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/35478328431.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/firuporosusepis.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/6053651791.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/76212208250.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/99896954365.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/34039178170.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/tojapowezi.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/dakikifegavig.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/kemebabiritar.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_093334_189.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/razugodosenujo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccac6c0d9b---linaloxa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/28699835478.pdfIn PDF document text
    • http://retailcop.ca/files/9992319409.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/vawemugazemasa.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/lifobanararijebiwozep.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/46708987172.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/80064921185.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xukelonen.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/44239612035.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 14668 bytes
SHA-256: 4eb96556be55c63560f10316f241dfde68e1ccdbce5cbc7fa2933edb275ee469
font_01_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 11096 bytes
SHA-256: ea1cf92b25baaa80a7ffff92c9536844588e6e4c438719504843771adbe57a94